Work-arm for sewing-machines



A. H. DE VOE.

WORK ARM FOR SEWING MACHINES APPLICATION FILED OCT. 30' 1918.

Patented Oct. 12, 1920.

INVENTOR' WlTNESSESI UNITED STATES PATENT OFFICE.

ALBERT H. DE JOE, GE XVESTEIELD, NEW JERSEY, ASSIGNGR' TO THE SINGERMANU- FACTURING COMPANY, A CORPORATION OF NEW JERSEY.

WORK-ARILVL FOR SEWING-MACHINES.

Specification of Letters Patent. Patented Oct, 12, 1920,

Original application filed May 18 1916, Serial No. 88,277. Divided andthis application filed October 30,

To all whom it may concern.

Be it known that I, ALBERT H. Von, a citizen of the United States,residing at \Vestfield, in the county of Union and State of New Jersey,have invented certain new and useful Improvements in Work-Arms forSewing-Machines, of which the tollow ing is a specification, referencebeing had therein to the accompanying drawings.

This invention relates to an improved form of work-arm for sewingmachines. and more particularly to machines of the teed-' oPf-the-armtype for sewing up tubular work, such as the machine shown in mycopending application Serial No. 98,277, filed May 18, 1916, of whichthis application is a division. I

The objects of the invention are to provide a work-arm having means bywhich the looper and feeding mechanisms may be readily inspected andadjusted, or if desired, completely exposed. V

In its preferred form the worlnarm is of a general trough or channelshape and extends first at an inclination from its support and thenhorizontally. A lower extension piece is secured to the free end of thearm.

at the extremity of which piece an end wall rises. Secured to the endwall and to the work-arm is a throat-plate. -'il1e,sides adj acent thethroat-plate are closed by hinged spring-pressed cover plates.

In the accompanying drawings Figure 1 is a vertical longitudinal sectionthrough the work-arm of the machine. Fig. 2 is a transverse sectionthrough the arm taken at a point just within the end wall. Fig. 3 is atop plan view of the arm, partly broken away and with the cover-plateand throatplate removed. Fig. 4 is a perspective of the throat-plate.Fig. 5 is a perspectiveof the extension piece, showing the hingedcover-plates.

Referring to the drawings, 1 indicates the base of a machine from whichprojects laterally a bridge member 2 having at its outer free end adownwardly projecting extension 3 all as more fully disclosed in mycopending application above mentioned.

Projecting transversely from the projection 3 is a work-arm which 1ssubstantially channel or trough shaped. The inner portionof the work-armis upwardly inclined, shown at 4, and its outer or free end portion 5 18Serial No. 260,257.

horizontally disposed, the upper side of the arm being normally closedby a cover-plate 6 secured thereto. Secured to the lower wall of the endportion 5 is the extension-piece 7 shown in Fig. 5, and the end wall 8rises from the free end of the extension piece. A throat-plate 9 issecured by screws to the end wall 8 and to the main body of thework-arm, said throat-plate forming a con tinuation of the cover-plate6. The throatplate has the usual needle apertures 10 and feed-dogapertures 11. At the sides of the extension-piece hinged cover-plates 12are mounted to swing outwardly and downwardly. As clearly shown in Figs.1,2 and 5, a leaf spring 13 is secured between its ends to the extensionpiece 7, the free ends of the spring bearing against the flattenedportions 14 of the cover-plate hinges to yieldingly hold thecover-plates in closed position. When the cover-plates are opened thespring also holds them in open position. Mounted to rock and slide inthe work-arm is a looper-shaft 15 carrying a looper-support 16 to whichare adjustably secured the loopers 17 Mounted in the end wall of thework-arm proper is a stationary threadguide 18 from which the threadleads to the loopers. A feed-dog 19 is mounted on a feed rock-lever 2Ofulcrumed on the links 21 at 22. Needles 23 are carried by a curvedreciprocatory needle-lever 2 1, whose hub25 is journaled upon a stud-pin26. The needle-lever, looper-shaft and feed rocklever are actuated fromthe main-shait 22'' in the manner fully disclosed in my copendingapplication above mentioned.

It is evident that by the use of the above described construction accessto the looper and feed mechanisms may be had at any time by opening oneor both of the hinged cover-plates 12, and if desired said mechanismsmay be entirely exposed for inspection and adjustment by merely removingthe throat-plate 9 and extension-piece 7.

' Having thus set forth the nature of the invention, what I claim hereinis- 1. A sewing machine comprising, in combination, a reciprocatingneedle, a hollow work-arm,a loop-taker mounted within the 2. A sewingmachine including a frame having a hollow work-arm free at one end andsupported at'its opposite end, an extension piece carried at the freeend of said work-arm, an upwardly extending end-wall carried bysaidextension piece, a throatcarried by said extension-piece, athroatplate secured at one end to said end-wall and at its opposite endto the hollow wort;- arm, and a cover-plate hinged to said ex- 2tension-piece and adapted to swing outwardly and downwardly.

4. A sewing machine including a frame having a hollow work-arm tree oneend and supported at Its opposite end, an extension-piece carried at thefree end of'said workarm, an upwardly extending end-wall carried by saidextension-piece, a threatplate secured at one end to said'end-wall andat its opposite end to the hollow workarm, a cover-plate hinged to saidextension piece and adapted to swing outwardiy'and downwardly, andyielding means for holdmg sa d cover-plate 111 closed position.

5. A sewing machine comprising, in comblnation, a frame includlng aneloi ited work-arm having at its free end a cavity, a reciprocatingneedle, a cooperating looptaker housed within said cavity, saidwvorlcarmincluding a main body-portion, an extension-piece closing the lower sideof said cavity, an end-wall carried by said extension-piece and closingthe outer end of said cavity, a throat-plate secured at one end to saidend-wall and at its opposite end to the main body-portion of saidwork-arm and closing the upper side of said cavity and a hingedcover-plate extending between said extension and throat-plate.

*6. A sewing machine comprising, in combinatioma frame including anelongated work-arm having at its free end a cavity, a reciprocatingneedle, a cooperating looptalzer housed within said cavity, said workarmincluding a main body-portion, an extension-piece closing the lower sideof said cavity, an end-wall carried by said extenwardly and downwardly,

sion-piece and closing the outer end of said cavity, a throat-platesecured at one end to said end-wall and at its opposite end to the mainbody-portion of said work-arm and closing the upper side of said cavity,and a cover-plate closing one side of said cavity and hinged to saidextension-piece to swing outwardly and downwardly.

'i'. A sewing machine comprising, in combination, a frame including anelongated work-arm having at its free end a cavity, a reciprocatingneedle, a cooperating looptaker housed within said cavity, said Workarmincluding a main body-portion, an ex tension-piece closing the lowerside of said cavity, an end-wall carried by said extension-piece andclosing the outer end of said cavity, a throat-plate secured at one endto said end-wall and its opposite end to the main body-portion of saidwork-arm and closing the upper side of said cavity, a coverplate closingone side of said cavity and hinged to said extension-piece to swimoutand yielding means for holding said cover-plate in closed position. Ir

8. A sewing machine having a hollow work-arm proper, feeding and looperniechanisms extending beyond the arm, and detachablemeans for inclosingsaid mechanisms comprising an extension piece having an end-wall, athroat-plate, and a hinged,

cover-plate extending between said exteu sion-piece and throat-plate; 1

9. A sewing machinehaving a hollow worl arm proper, feeding and loopermechanisms extending beyond the ann,'and detachable means for inclosingsai-d mechanisms including means for affording access to them'whileinclosed.

10. A sewing machine having a hollow work-arm proper, feeding and loopermech-' anisms extending beyond the arm, detachable top, bottom andend'walls inclosing said mechanisms, and side walls hinged to saidbottom wall and yieldingly held in open or closed position.

11.A sewing machine having a hollow work-arm, feeding andloopermechanisms extending beyond the arm, detachable top, bottom andend walls inclosing said mechanisms, and a retractable side wallaffording access to said mechanisms whileinclosed.

In testimony whereof, I have name to this specification.

ALBERT n. DE yon signed my 7

